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Can You Solve This Grade 12 Geometry Problem From Australia? The Marshmallow Chocolate Puzzle

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Channel: MindYourDecisions
Categories: Brain Teasers   |   Geometry   |   Math  
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A marshmallow has the shape of a cylinder with diameter 5 and height 3. A dessert is made with 24 marshmallows: there are two stacked layers of marshmallows, and each layer has 3 rows of 4 marshmallows. The gaps between the marshmallows are filled with chocolate. What is the volume of chocolate in the dessert? This problem was asked to grade 12 students in an Australia test. Can you figure it out? Watch the video for a solution.

My blog post for this video:
http://wp.me/p6aMk-4Wu

Sources for question
http://www.smh.com.au/nsw/hsc-2016-mixed-verdict-on-maths-exam-from-students-but-formula-reference-sheet-a-bonus-20161021-gs7inz.html

http://atarnotes.com/forum/index.php?topic=168134.0

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